Sliding vane pump modification

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Our factory has a propane unloading pump; the motor was connected to the pump via a belt. After inspection by experts, it was advised that using a belt for this connection is not allowed, so we now need to switch to a direct connection. The motor is a 4-stage motor with a speed of 1440 revolutions per minute and a power of 4 KW. With the motor’s small wheel and the pump’s large wheel, the actual rotation speed of the pump is calculated to be only 650 revolutions, based on the formula N2=N1*D1/D2. The nameplate specification of the pump indicates an shaft power of 2.7 KW, a flow rate of 10.08 cubic meters, a head of 27 M, and a rotational speed of 2900 revolutions per minute. Can we now replace it with an 8-stage, 4KW motor to connect the pump directly to the motor coupling? What impact will such installation have? The pump is a vane pump.