Ah, yes. Well I will try to send some pictures as it is sometimes tough to see. In hand the differences are quite obvious though. The only packaged matte unc sets are the FM issues through 1974. After that, none.
THe 1974 sets of any of the standard FM coins are easily had and my not be a bad idea just for reference to add to your collection as they can be gotten for 30 USD or so, and the later mattes (not in sets to the best of my knowledge are of the same finish).Please do not be insulted, but thumbnail of the three finishes:
Uncirculated - (M) matte: the coins have a uniform satiny finish over the whole coin, devices and fields and lettering
(U) prooflike: the coins have a uniform semi-reflective finish over the whole coin, devices, fields and lettering
Proof - (P) proof: the coins have reflective fields and contrasting frosty or satiny devices and lettering
I apologise that my ability to send pictures is severely limited. If you PM me your email I can send many more images. BTW, FM matte are quite different than classical Royal Mint mattes, even though they do resemble each other just a bit.