Minnie, it looks like you've got maybe 16 weeks between the two (minimum 13-14, right?). I don't know how much training you're doing or how your week looks, but based on that timescale I would personally treat the two as separate events.
I couldn't sustain such a long training period of high mileage without a break, so I'd take the taper and the recovery properly before starting on the marathon campaign with that good base you've already built.
However, absolutely each to their own.
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