I also have a wide foot an have brought Old West boots that I find are a bit wider than some other brands, so depending how much bigger the 11 was maybe look at a half size smaller 10 1/2.
There are also some boots that offer a wider width in their sizing, so perhaps try looking for the wider width boots.
An I always check the sizing guide that comes with the boot your looking at as different brands have different sizing.
Hope this helps. :)