I haven't seen the expansion cards in the flesh but would presume the difference is..
1200/4/ADD4 expansion has a male (pin) connection
1220/4/ADD4 expansion has a female (socket) connection
Just having a quick peek on bboah it appears that the 1220 board has two rows of pins whilst the 1200 board has three rows of sockets; so presumably their is a difference in the upgrades.
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