the fit between the matumbos and the victories is the same. they both use the same last for the fit, the matumbos do have the arch so they might feel slightly different when it comes to being on your foot but they are both the same width.
the victories are a narrower shoe, so it would be best to go half a size up just in case. the victory xc's fit the same as the track versions but like i said with the arch its going to feel different on your foot but sizing and fitting is the same. both equally narrow.
the puma slx zones i dont know about fit but i do know they are a knock off version of the matumbos, but a pretty good one from what i've heard. they use the same horseshoe plate styling as the matumbos with sharkskin in the heel. same outsole styling but have a slightly higher heel and also more flexible, but not too much more. puma usually sizes out pretty evenly with nike but not always so be careful. a good palce to look/ask is tracktalk in their spike section.
the brooks wire has a snugger fit due to the upper. it has a meshlike upper so it can accomodate roomieness better. from what i've heard they fit slightly smaller, but then again all spikes do as they are supposed to so you can disregard that bit unless brooks has contorted how spikes should fit. they have a wider fit to them as well.