I agree with above^^^ as long as it similar (dia and length)cu in, plumbing will work and number of compartments. if cost is less I would. Is the original a single, double or triple compartment tank?
We use jobber air tanks on a regular basis, the price from BB is crazy. Usually the jobber tanks have more than enough ports. The ones I buy have mounting flanges, which I just cut off and use the existing mounts.