johnnie donut

I am trying to slow up my bike because of the trails I ride The bike is a fat tire mid drive 44 tooth Bafang 510. I can not buy just the outer ring that has the teeth just the whole sprocket. I can only find the 40 teeth chainring made for a narrow tire. I am thinking about buying it and changing the outer ring I am sure they have the same hole pattern? They both have 5 spoke patterns and look the same?