That's a very nice Roe antler - lots of knurling. Can't tell the age of a deer by the antler but It looks like it's from a mature buck. Six points is as big as a Roe gets.
You might be looking for a while to find the other one though !
Looks quite white, They come out of the velvet white but are coloured very quickly by the tannins in the trees they fray, dirt and anything else they decide to attack with them.!
Pot Perm in solution turns the antler brown on contact so if you wanted to you could create a bit of depth by pianting the valleys and leaving peaks white !
Whatever you decide to do I'm sure it will look great.
Cheers
Mark