No, Simon, the forums are not the same, but some of us look for posts in both forums.
This one here is maintained by Cypress Engineers, so when one of them reacts here you can rely on an official answer.
http://www.schmartboard.com/index.asp?page=products_dev&id=648 PSOC 3 & 5LP proto dips
http://www.cypress.com/?rID=60890 PSOC Family Comparisons
https://www.sparkfun.com/products/8480 PSOC 1 Proto Boards
http://www.cypress.com/?rID=2545 PSOC Brochure
All families mainly SMT packages, PSOC 1 limited DIP, mostly SMT.
Additional capability in PSOC 1 family of Power PSOC, and Wireless Capability
PSOC 1 parts as low as < $ 1, PSOC 3 as low as $ 1
PSOC 1 Proprietary core Switch cap analog blocks 32K FLASH limitation Fixed function Digital
PSOC 3 8051 Core Digital Filter Verilog Design Capability Very diverse digital
PSOC 4 ARM Cortex M0 Low end 32 x 32 MUL Verilog Design Capability Very diverse digital
PSOC 5 ARM Cortex M3 High end Digital Filter Verilog Design Capability Very diverse digital