The base M4 14-inch Pro has separate battery, fan and MagSafe connector guides.
What to check before buying
Cooling
iFixit lists a fan procedure for the base M4 model, separate from battery and charging work. A noisy fan and reduced battery life involve different assemblies.
Charging and battery
The MagSafe connector and battery have their own guides. Parts for the M4 Pro or Max variant should not be selected solely by screen size.