Of course you can use them. There's no difference in image quality - the glass is the same, it's the mount holding the glass that's different. The slim mount is usually for wide angle lenses (with the standard F-Pro mount you will likely get vignetting at wider than 28mm on a full frame body or wider than 17mm on a 1.6x crop body).


However, there is a big difference in convenience of use - the regular B+W SLIM mount filter doesn't have front threads, meaning your Canon lens cap won't work so you'll need to use the slip-on cap that comes with the slim filter - those are easy to knock off, and I really don't care for them. So, if this is for a CPL (which isn't left on the lens all the time), that's fine - I have a slimKäsemannCPL, it's great. But, if this is for UV/protection filters that are going to remain on the lens I'd stay away from the slim mount. (As a side note, for UV filters on wide angle lenses, I recommend the newer B+W XS-PRO mount - it's a slim filter, but with front threads - I use one on my EF-S 10-22mm).