No, the plug will fit, but the 128 won't have any sound and I think the psu will not like that (and the C128 as well ! )
The reason is that the Amiga psu is 5V= and 12V=, while the C128 needs 5V=, but 9V~ !! The 9V~ is mainly for the SID, but I think also some other chips need it. 12V= instead of 9V~ will not do the 128 any good !
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