Author Options:

WARNING: Are fitting lengths universal? ? Answered

(Sort of rhetorical...)
Just a heads up:
Be careful when selecting your fittings. Try to pick the SAME BRAND, grab a tape measure from aisle #23 and measure at the store (calipers work best).
Also, try not to mix sources if possible.
Bought fittings from Lowes. Got home and noticed they were a little different. All were 90-degree elbows but it looked like they were from different manufactures (text written on the elbow).
Some elbow were 1.75in length (as stated in your example), but some were a little shorter. (maybe1.6in). So just take an extra minute to measure before you buy.