Roses

I think the climber stays as a climber and the shrub as a shrub. I think they graft into a rootstock that has a more vigorous growth habit? Able to take up more nutrients etc.
But the graft doesn't make it climb, the top growth grows the long stems?. I also have the same rose as a climber and a shrub. They often sell the same varieties as standard, shrub or climbing.
I believe standards have several roses grafted into the rootstock to be able to form the ball.