Can I use a 3/8" NPT coupling to join these pieces, or do I need something else?

I'm trying to connect this angle stop supply riser (end in 3/8" male threaded) to this faucet with integrated hoses (ends in 3/8" female comp threaded) with some kind of 90° adapter to fit in a specific space.

I have searched for this part, but every 90° connector ("street elbow"?) I can find pretty much anywhere – Amazon, HD/Lowe's, specialty plumbing sites –is only in 3/8" NPT threading. Even parts that say MIP/FIP in the title - like this - are in fact an NPT taper (per an answer from the manufacturer in the Q&A).

My understanding is the two pieces I have I have are straight non-tapered threads (MIP/FIP/comp?), so I was looking for that but I can't find it. is NPT just the standard and will these fit/seal on a tapered connector (some of the ones on Amazon don't look very tapered but I have to take their word for it)?

If not, where on Earth can I find a 90° piece like this that is in 3/8" standard straight threading?