https://wccftech.com/m1x-macbook-pro-will-see-price-increase-but-feature-same-performance-across-14-inch-and-16-inch-sizes/

While Apple might have used the same M1 chip for a variety of MacBook models, if you check with a bit more diligence on the company’s website, those differences start to become more pronounced. Fortunately, the M1X MacBook Pro models are not expected to ship with those differences. According to one tipster and that is excellent news for customers that want a compact notebook without sacrificing performance. However, the redesigned M1X MacBook Pro models could see a price hike compared to current models.

An update from dylandkt on Twitter talks about the M1X MacBook Pro touting the same performance, irrespective if you purchase the 14-inch and 16-inch variants. Since both sizes will feature the same M1X processor, the performance gains are bound to be similar unless Apple decides otherwise. The current 16-inch MacBook Pro features Intel's powerful chips with better thermals compared to the 13-inch model. It is a great option for users who opt for a smaller size but do not want to compromise on the performance. However, the M1X MacBook Pro might see a price increase, according to the leaker.