The encapsulation replicate command is supported on 3560/3750 switches but for SPAN only. According to the 3750 config guide:
For RSPAN, the original VLAN ID is lost because it is overwritten by
the RSPAN VLAN identification. Therefore, all packets appear on the
destination port as untagged. "
I think if you have sup720/sup32 under IOS, you can use ERSPAN, which does preserve the original VLAN ID on the ERSPAN destination port.