Heater/AC Climate Controls

What is your question?

My mechanic told me that the Heater/AC Climate Controls need replacing. The heat does not work and the AC on light stays light even if it not blowing. Only cold air will blow. The cost? $1100! I can see why because the part lists for $900+ new. However, I found them used on Ebay for $50-$100 but the part numbers do not match exactly although they look exactly the same and from the same year. Could this be an issue? Does it matter if the controls are from a V70 wagon that it is not XC? Thank you.