I changed my window frame and found wood rot between the plywood bonded to the fibreglass cabin. I cut it out, bonded in new plywood with epoxy . I will have teak trim going over the but joints.

I took a bit of ply offcut to Bunnings and they put about 6 different brands of Jarrah and teak stains but I couldn't get a match which was close.
As the wood is bonded I don't have a second chance if I get it wrong.
Any suggestions on how to get a better match?