[Q] flash-all, wondering if everything ran okay

Apologies if this sounds like a silly/obvious question to ask, though I'd just like some clarification.

I'm flashing back to Stock 4.4.2, and I'm wondering if everything ran correctly.

In the DOS window it says that it failed to open HHZ11K, and "M8974A, though just under it says that it is that version and 4.4.2 is KOT49H not HHZ11K, even though I downloaded KOT49H.

Within my phone it says the following:

Baseband M8974a-1.0.25.0.23
Build: KOT49H
Version: 4.4.2

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Also wondering in the process of installing a new custom ROM should I:

- old rom
- wipe everything (data/system/cache/etc)
- reinstall stock 4.4.2
- install new custom rom

or

- old rom
- wipe everything (data/system/cache/etc)
- install new custom rom