will this work from a 4 pipe boiler to a 2 pipe boiler?

i have conventinal fsb 30kw boiler which has blown.it is a 4 pipe system, 2 pipes for coil in copper cylinder for gavity fed domestic hot water and 2 pipes with pump for heating. i can get hold of a new boiler conventional. NONE condensing but it is only 2 pipes into boiler flow and returns together, and will the pump affect anything, or will i need divertor valves. has anyone please got i schematic drawing.