Apple includes the same 20W ( used to be an 18W ) USB-D charge block across ALL iPad models now, to have ONLY one power/charge block to use with all the current iPad models.
Apple will supply the correct cable to use with that USB-C charge block.
Has NO bearing about faster charging ANY iPad, especially base model iPads.
Apple still sells the 12W power block for older iPad models that still can use these, but for the past few years, Apple has standardised the power/charging blocks for all iPad models and no longer sells these with iPhones to minimise waste if users already own a 12W, 18W or 20W or greater Apple power/charge blocks to charge their devices.
If your 7th gen iPad is, by some miracle, charging faster with that 20W power/charging adapter, then no one here is going to be able to confirm that.
My wife's 8th gen iPad charges to 100% in about 4-1/2 hours with the 20W adapter and a USB-C to Lightning cable.