Are the magazine throats in the Winchester 1400 and 140 the same?

No, the magazine throats in the Winchester 1400 and 140 are not the same. The Winchester 1400, being a more modern design, features a different magazine configuration compared to the older Winchester 140 model. This difference affects compatibility, so parts from one model may not fit the other. Always consult specific manufacturer guidelines for accurate information on parts interchangeability.