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Rule one: If you are not sure about your filters -REPLACE 'EM. Now!
I'm not sure anymore what the filter life is on either of those masks, but there should be a small PMCS booklet with each mask. That should tell you what you need to know. Have a HAZMAT qualified /NBC trainer go over the masks with your staff. Those masks will not help if you do not know how to use them. Several Israeli citizens died from improper mask use, while none died from chemical attack!
I have a M40, and several canisters + 2 civilian market hood units for my son (4) and my wife. These masks are are checked monthly. Better safe than sorry!
My fervent prayers are that we (or you and your staff) never need them.

Cav, thanks much...but I'm in an environment where the masks were given to me "as is" with the provider not expecting too much fuss. It's a PC move for them to say they issued masks...gives them the warm and fuzzies. I say they are worthless and need something in writing. You know, and I know, as well as many that will post here, that if in doubt, a replacement is needed. However, those providing the mask have to be forced in that direction. All the manuals included with the masks are either gone, or don't refer to filter shelf life at all (believe it or not).