My 2018 R8 Royal Teaburst has such oddball grain (in a good way, ha!) that finding a really good match to a real Burst is, well... difficult. But I do have to say that 8 5495 (aka "Molly" or the "Seven Decades Burst") is the closest I've found in terms of the oddball grain principle. Color is pretty close too, I think (8 5495 may be just a tad redder, but it's tough to say because pics pull more red out of Teabursts than exist in person--I have to intentionally try to take pics that don't "over-red" my R8). Anyway, I am claiming 8 5495!
My R8 on the left, 8 5495 on the right.
P.S. The pics in BOTB (pg 28) of 8 5495 do not show its true beauty, so I sourced the above pic of it from burstserial.com.