Relacing old boiler with 2 wallhungs

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Plumber69

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Old boiler has 2 1/2" send and return. On my new setup 1" comes off boilers with tie into 1 1/2" to the low loss header (primary loop). Should I keep it 1 1/2 then up size to 2 1/2 on secondary loop. Or run 2 inch on secondary loop. Will it make a difference

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Fitter30

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Hydro separator don't know what pipe size it is but keep as much 2.5" within a few feet. Usually ex tank is piped on the secondary loop.
 
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