Sorry but the engines listed above are not identical. Mikado has a different motor, different size wheel, different gearing. Sumter valley has an idler gear so different gearing for sure, 25201 has the same as some stainz engines but some engines had diode bridges if they had 5 volt lights. And if DCC/MTS_MZS was installed they never run the same as engines without DCC.
Note that DCC engines can be tuned to run together, one of the great advantages of DCC. You can adjust acceleration, start and top speed parameters on each individual engine.