It all depends,, which is not very helpful I know !
To explain the hole size in the centre, centre of hole to edge distance and shape all vary slightly . There will be an ISO code for the tips ( international standard organisation ( I think is the actual name )) and if you can get that then look for that to buy them.
They will be cheaper that way as very few manufacturers will make their own tips , they will be bought in but they wont tell you the codes.
heres a guide to tips
Carbide Insert Designation Chart
www.carbidedepot.com
Hope that helps?