Unless the fan was pulling air, the 140 to 120mm adaptor looks like it was installed the other way around.

IMO the test should reflect real world situations.
which means using 120mm for a 120mm radiator and using 140mm fan for a 140mm radiator.

Using Yate Leon 120/140 mm fans is the closest as you can get in terms of similar fans.
Testing them in same RPM or same noise level would be the wise thing to do.

Thanks for the test results anyway.