[Coryx9090x]

I bought a 2004 United Motors DS200 bike that's needed a rear wheel along with rear brakes and rear sprocket, and have not been able to find one any where. Ive looked for a replacement on numerous websites but to no avail. So my question is, Is it possible that I get a wheel that is the same size rim that has the rear brake drum and a different sprocket (lets assume this is off some completely different bike but with the same size rear wheel, uses a drum rear brake, but with a different sprocket as stated) and it actually fit on my bike? Any thoughts on the matter will be extremely appreciated. By the way I have found a rear wheel to a Roketa but isn't as wide as my rear wheel on mine. The rear wheel on that bike has the same width as my front wheel, and would that be a problem? If not I'll probably get it because I can get the complete rear assembly pretty cheap for it. Once again, Thanks.