Murray going back to the graphene radical paintjob instead of the new xt radical

In the beginning of the australien open, Andy is using his new paintjob for the head graphene xt radical, but against milos he seems to have switched back to the old regular graphene radical paintjob, isn't this quite strange?
https://twitter.com/head_tennis/status/690849159797198848

https://twitter.com/atpworldtour/status/693052790499840001