Want to buy a few rifles in  the 270 Winchester 243 Winchester and 30-06 rifle and was wondering if they are different enough to buy ?

Yes, they are different enough to buy but versatility in loadings goes to the 30-06.  Everything you can hunt with a .270 or .243 you can load a 30-06 for.

The .30-06 Springfield and the .270 Winchester are going to be fairly close in terms of performance, with the .30-06 having an edge over the .270 in terms of overall power.

The .243 Winchester is more in the class of cartridges such as the 6.5 X 55 mm.  Its bullet weight and diameter are much less than the .30-06 and it has considerably less kinetic energy than either the .30-06 and the .270.

.30-06: deer, antelope, black bear, elk, bighorn sheep, moose, grizzly

.270: deer, antelope, black bear, elk, bighorn sheep, moose

.243: varmints, deer, antelope, black bear (where legal)

The .243 Win is a great combination varmint deer gun.  If you need to shoot something bigger than deer without a last name of bear the .270 Win or .30-06 Sprg would be a great choice along with the .308 Win.

i would ask the place you bought them from about it

I don't think you know what you mean .