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I don't think that you'll run into any longevity/durability issues that are directly attributable to mixing different brands of parts...as long as the parts are setup properly.
With the spring/spring guide out of the mechbox and the rest of the parts installed (the mechbox is laid open), disconnect the tappet plate spring (or better yet take the tappet plat and nozzle out for now).
Ensure that the cylinder head/cylinder is positioned in the mechbox and place the piston all the way into the cylinder until it bottoms out. Gently turn the sector gear until the first tooth of the sector gear engages the most rearward (1st) tooth of the piston. If it is engaging nicely then you should be ok to go.
If the sector gear tooth is hitting the piston's 2nd tooth then your piston/piston head/cylinder head combo is too long. If you run it like that the sector gear will eventually (or maybe very quickly) mash your piston, at the very least if you're lucky.
If the sector gear tooth is hitting the piston's 1st tooth, or engages it "early", then your combo is too short. You can put a washer between to the piston and piston head to lengthen it, but be sure that it's a good fit.
If in doubt, and if it looks ok but maybe just a hair off...I'd run it for a couple of hundred shots and then tear it down to inspect for wear.
You can also drill out (just a little) the Guarder cylinder head to make it fit your mechbox. Sometimes all it takes is a little beveling of the holes to get it in place.
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