The R5 3600 is significantly more powerful. Same core count, but it features SMT (similar to Intel HyperThreading)
Supposedly Photoshop prefers Intel, but honestly, with this current generation (like the R5 3600), that advantage isn't really a thing anymore. You won't run into issues, and Ryzen is definitely better for futureproofing.
By the way, if you're looking to save some cash, you could just look at the previous two generations. Still 6-core/12-thread, same socket.
You won't notice much of a difference. The R5 3600 is the best buy of this generation, but those older chips offer even better value.
https://www.amazon.com/amd-cpu-desktop-cooler/s?k=amd+cpu+desktop+coolerhttps://www.amazon.com/amd-ryzen-5-2600/s?k=amd+ryzen+5+2600If you don't need a VGA, just forget about it.
If you're trying to hook up a second monitor to a GT1030 by using both the HDMI and DVI ports, just grab a passive DVI to HDMI adapter. It's easy, costs maybe 10-$$6.75, and it's way cheaper than a VGA adapter which has to be active.