mid 2009 13" macbook pro battery 60watt hours vs 63.5w??

I have a mid 2009 13" mbp, and as they do, the battery has been getting weaker and weaker. Having check the serial codes I ordered one online which I have fitted.

When I plugged the computer in to charge, the LEDs on the side flashed 5 times ( which Apple indicated means the battery is not charging/fitted).

I opened it back up and realised its the 63.5 watt hours battery I have been sent, not the 60w.

My question.... can they be used interchangeably or will I need to order a new battery?