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You could run say a 160mm blade if its specced for a 165mm, but it would affect your depth marker so not ideal. I would personally stick to the size its specced for. Bear in mind you'll likely have to shift your splinter guard if you change blade types as the kerf will be slightly different. Also if the saw has a riving knife, obviously don't go thicker. Makita use thinner kerf blades than most of the other brands which leads to a faster/easier cut, but I would have thought at the expense of more blade deflection.
Hovis-
Yes, sounds like not worth changing the blade size.
Just taken delivery of an Erbauer which comes with a 185mm, 48t, 2.2mm kerf and 20mm fixing bore. Problem is I now realise that Screwfix, and no one else, seems to sell the exact replacement blade. This is the closest I can find - https://www.amazon.co.uk/TCT18580T-Saxton-Circular-Makita-Dewalt/dp/B01MSZEX56/ref=pd_rhf_gw_p_img_4?_encoding=UTF8&psc=1&refRID=QM34AV0FX0ZF88DACBCC
This and the fact that the rails don't seem to be perfectly flat makes me wonder if I shouldn't be swapping it for something else. How big a deal is 0.2mm increased kerf?
ILb
Is it also possible to run slightly different size blades in a track saw?