I have an econometric model using multiple linear regression.

lets say Q=alpha+beta*P1+gamma*P2+residuals

I would like to ask if the absolute values of P1 matter in estimating the correct coefficients. If I would run the regression with P3 (P3=P1-x; x being a real number) instead of P1, would I get the same result and just a different alpha, or would the estimate itself be different?

thank you for advice