The first one should be preban, but the second is a postban, I believe. H&K imported these until 1996, so just because it is H&K marked doesn't mean it is preban.
Here's a registry with some pre/post serial number info:
Looks like the cutoff for the Benelli M1's is somewhere around 198XXX. The preban one is a steal, if in condition described, BTW. I wish I had the extra cash handy - I'd pick that up and dump my postban.