It's not drastic by any means. The two big differences in injector blades are the Edgewell/Personna and the Chinese Schick, or 'Chick' as we call it. There is a third, the Schick Proline (B), however it is made in the USA and not Japan as many think. I used to think it was slightly better than the 'Chick', now I am not so sure. They may be the exact same blade except for the rounded corners on the former that causes it to sit a tad different in an injector razor.........in theory.
Just try one of each in your razor and decide for yourself. Just remember the most important rule I see so many violate when doing testing: only change one variable at a time.