I'm going to get V & H big Radius pipes for the CVO Deluxe.

Would there be much difference with a K&N Breather vs stock?

Stock breather....

K & N....

None

You can't convince some people though, I know, I've tried.

No difference but if you like the look of one over the other you could easily see the one you have already

I changed to a K&N filter in mine, only because I like the red look, I think they are the same filter
only the original is white.

That big heavy breather suits the street glides though, a bloke I know has one on his, told me it ran like shit for a bit but the ECM learned and now it goes way better lol, the extra induction noise is his performance boost I'd say, just smile and wave boys, just smile an wave

You can get a K&N replacement air filter unit to replace the 'white" one in your first photo if you need to.

The big pointy forward "heavy breather" (second photo) can foul some folks legs a little.

I have them on both of my bikes ( as stock from new !) but I'm 34inch inside leg and have no clearance drama

Mate of mine , a short guy , had a stage 4 Streetglide 103 , and had the first photo aircleaner because he had to, with a K&N filter , not the stock Harley one the kit came with