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OT neg feedback winding

Replaced a blown OT on an old Ampeg M15 30w, two 6L6’s. Even though the schematic shows that the negative feedback from the OT is the same lead that goes to the speaker, it turns out the actual OT uses an additional winding for feedback.

Checking around in another forum the claim is that the original OT “OT-213” is a 6.5K 8/16. My replacement is a Hammond Vibrolux type 4K 4/8/16. Seems to work fine. My question is:

Why use an additional winding for the negative feedback? ( it is nice having the extra lead but…)?

Should I assume that the original amp used the 16 ohm tap for feedback and I should also use that winding in my repaired amp?

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