as long as you match across the axle you'll be fine.
if swapping to a new tyre do the rears now, and the fronts later when they have worn.
as long as they are good tyres there isn;t an issue just avoid ditch finding tyres so stay away from the budget end.
also people keep saying falken are budget tyres, they aren;t they are a mid range tyre. same as toyo, Vreds, Kuhmo etc