If it was from a Lancaster, it would probably be an FN20 rather than an FN4. I’m afraid that I can’t tell the difference from your photos, although the FN20 was slightly wider. The Sunderland did have a four-gun tail turret but this was an FN13.
Mk1 Sunderlands had the FN13 tail turret I believe, but MK2,3’s had the FN4 as shown in first pic on one of the six MK3 Aussie Sunderlands ML732 to serve here.
Although from my research on the front turrets there was a mixture of FN11 single Vickers GO (which we have an surviving example of ) and FN5b twin Browning turrets fitted, so this may have applied to the tail turrets as well?
From what I can see from my comparison pics, the turret framing members in question looks like a FN4 rather than Lanc FN20/120 ?
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