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@rhb
There's a 15s per km difference. Was the weather comparable on both courses, plus your preparation and general well being the same?
For the flat course pace yourself against the km markers at the 15s per km quicker pace. That'll give you 5 x 4m08s efforts to challenge you, or try run 4.12 4.10 4.08 4.06 4.04 for a nice -ve split.