If you have already bought parts, try them.
Otherwise, I suggest you buy all the ram you might want up front in a 2 x ?? kit.
Ram is sold in kits for a reason.
A motherboard must manage all the ram using the same specs of voltage, cas and speed.
The internal workings are designed for the capacity of the kit.
Ram from the same vendor and part number can be made up of differing manufacturing components over time.
Some motherboards, can be very sensitive to this.
This is more difficult when more sticks are involved.
That is why ram vendors will NOT support ram that is not bought in one kit.
Since you will be using a discrete graphics card, ram speed is not quite as important.
Still, ryzen responds to faster ram.
Ryzen is picky about ram.
Use due diligence in your research.
Not all DDR4 ram will work.
You want documented ram compatibility. If you should ever have a problem, you want supported ram.
Otherwise, you risk a finger pointing battle between the ram and motherboard support sites, claiming "not my problem".
One place to check is your motherboards web site.
Look for the ram QVL list. It lists all of the ram kits that have been tested with that particular motherboard.
Sometimes the QVL list is not updated after the motherboard is released.
For more current info, go to a ram vendor's web site and access their ram selection configurator.
Enter your motherboard, and you will get a list of compatible ram kits.
I might also suggest you re-evaluate the purchase of a apu processor when you intend to use a discrete graphics card.
The 2200g is a very good processor for what it is, but I wonder if you might be better off with a normal ryzen processor.