Yay! This seems to be the problem. Somehow the 'order_id' field from the 'zen_paypal' table of the 1.2.4 got a prefix as well, rather than just all the tables. If I rename the 'order_id' field in the new db to 'zen_order_id' then everything seems to work fine.
I assume my fix is a hack, though, and the preferred method would be to leave the db as it was and change whatever is looking for 'zen_order_id', right?




