i'd email them and ask. We don't have CanadaRAM here any more to provide authoritative answers on this subject. They one you're looking at also says PC5300 as opposed to PC2-5300 - i have no idea what difference this makes if any... 😱
Sometimes it's just less heartache to go with a supplier that guarantees it, even if you pay a little more. I'm sure CanadaRAM said something somewhere that there are subtle differences even within manufacturers, which is why Crucial frinstance, sells Mac guaranteed RAM and non-Mac guaranteed.
I've used second-hand generic brand PC RAM in the past and not had problems (that i'm aware of at least) with it in G3s, but maybe i'm just a tin-arse.