Upgrade old furnace burner to Beckett

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Boston, MA
I have an old furnace and would like to upgrade its burner to a newer Beckett, as I have in another furnace.

I have pics below of the old and new furnace/burner. I have been told that a Beckett AFG (like the one on the newer furnace) will work fine on the old furnace, with some work required at the mating flange (?).

I would prefer a used burner. I do NOT want to replace the old furnace as it's been working fine and I only intend to keep the building for a few more years before a major rehab. Of course, if a package deal can be had (used) I may as well replace the whole thing. The old burner has been working fine except recently requiring a reset occasionally - first occurance, another within three weeks, another within three days. I'm hoping to get by until the heating season ends before I tinker with it. It immediately starts upon reset and works fine.

Can anyone advise on this course of action? What burner should I look for? I'd like to stick with a familiar burner, like the other Beckett I have. Would I need a permit? Would a plumber even take on such a job?

Here are pics of the newer burner:

Here are pics of the older burner:

Any help appreciated.
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