For what it's worth - and since this has gone a bit off topic - I have a 2014 TE310R, read the horror stories about the plastic elbow and ordered the Zip-Ty aluminum replacement.I wouldn't think 0.02mm would make any difference. Compare the groove depth and if they are machined deeper on the aluminium elbow then just use fatter O rings.
However, when I finally got around to removing my tank to make the swap I was pleasantly surprised to find mine already had an aluminum elbow that fit perfectly. Since I bought the bike new (0 miles) I'm sure this was OEM.
For those with a 2014 and have yet to remove your tank I suspect the dreaded plastic elbow is likely a non-issue for you too. I'd at least check before doing what I did - ordered an "upgrade" that I did not need.
My 2014 OEM tank...