Not sure if the chassis are both E.....I don't think so...

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show ver
Cisco IOS Software, s72033_rp Software (s72033_rp-ADVIPSERVICESK9_WAN-M), Version 12.2(33)SXI8, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2011 by Cisco Systems, Inc.
Compiled Sat 22-Oct-11 01:53 by prod_rel_team

ROM: System Bootstrap, Version 12.2(17r)S2, RELEASE SOFTWARE (fc1)

uptime is 3 years, 3 weeks, 3 days, 19 hours, 17 minutes
Uptime for this control processor is 3 years, 3 weeks, 3 days, 17 hours, 52 minutes
Time since switched to active is 3 years, 3 weeks, 3 days, 18 hours, 6 minutes
System returned to ROM by  power cycle (SP by power on)
System restarted at 17:37:45 EST Tue Nov 15 2011
System image file is "disk0:s72033-advipservicesk9_wan-mz.122-33.SXI8.bin"
Last reload reason: power-on

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cisco WS-C6509-E (R7000) processor (revision 1.5) with 458720K/65536K bytes of memory.
Processor board ID SMG1422N01J
SR71000 CPU at 600Mhz, Implementation 0x504, Rev 1.2, 512KB L2 Cache
Last reset from power-on
1 SSC-400 controller (1 IPSEC).
19 Virtual Ethernet interfaces
48 FastEthernet interfaces
60 Gigabit Ethernet interfaces
32 Ten Gigabit Ethernet interfaces
1917K bytes of non-volatile configuration memory.
8192K bytes of packet buffer memory.

65536K bytes of Flash internal SIMM (Sector size 512K).
Configuration register is 0x2102

show ver
Cisco IOS Software, s72033_rp Software (s72033_rp-ADVENTERPRISE_WAN-M), Version 12.2(33)SXI8, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2011 by Cisco Systems, Inc.
Compiled Sat 22-Oct-11 01:53 by prod_rel_team

ROM: System Bootstrap, Version 12.2(17r)S4, RELEASE SOFTWARE (fc1)

uptime is 1 year, 25 weeks, 5 days, 17 hours, 50 minutes
Uptime for this control processor is 1 year, 25 weeks, 5 days, 17 hours, 41 minutes
Time since switched to active is 1 year, 25 weeks, 5 days, 17 hours, 47 minutes
System returned to ROM by reload at 02:33:27 UTC Sat Mar 25 2000 (SP by reload)
System restarted at 22:58:49 UTC Tue Jun 11 2013
System image file is "sup-bootdisk:s72033-adventerprise_wan-mz.122-33.SXI8.bin"
Last reload reason: reload

cisco WS-C6506 (R7000) processor (revision 3.0) with 458720K/65536K bytes of memory.
Processor board ID SAL0803SXWD
SR71000 CPU at 600Mhz, Implementation 0x504, Rev 1.2, 512KB L2 Cache
Last reset from s/w reset
7 Virtual Ethernet interfaces
48 FastEthernet interfaces
50 Gigabit Ethernet interfaces
8 Ten Gigabit Ethernet interfaces
1917K bytes of non-volatile configuration memory.
8192K bytes of packet buffer memory.

65536K bytes of Flash internal SIMM (Sector size 512K).
Configuration register is 0x2102

Yes, they are:

WS-C6509-E

HTH

  I dont see where the 6506 is an E chassis  .  The 6509 is a E chassis .

My apologies Glen and Arthur.  Only 6509 is E.

Reza

According the documentation i've found on the Cisco site...they don't have to be both be E-Series Chassis.  See the second bullet.

4. VSS utilizes existing multilayer switching architecture.

• VSS enhances existing multilayer switching architecture using simplification of architecture without fundamentally changing the architecture resulting in easy of adoption of the technology.

• Uses existing Cisco Catalyst 6500 investments, easing the deployment of VSS. The VSS is supported on non-E and E series Catalyst 6500 Series Switches chassis and supports all Cisco Catalyst 6500 series 6700 series modules.

• VSS uses standards-based 10 Gigabit Ethernet connectivity between the Cisco Catalyst 6500 virtual switch members, allowing for flexible distance options. The underlying physical switches do not have to be collocated.

Source - http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-6500-virtual-switching-system-1440/prod_qas0900aecd806ed74b.html