Entry-level M2 MacBook Pro has a slower SSD - 9to5Mac
MacBook Pro Retina 13” (Early 2015) 128GB SSD
128GB SSD Solid State Drive (SSD) 656-0021B for MacBook Pro 13" A1502 2015 Compatible Model: Macbook Air 13 "A1466, Macbook Pro Retina 13" A1502, Macbook Air 11 "A1465, Macbook Pro Retina 15"
MacBook Pro 13" Retina Display Early 2013 SSD Replacement - iFixit Repair Guide
512GB version of the new MacBook Pro has a slower SSD than the Mac it replaces | Ars Technica