will a Ew2-1448703 civic motor replace a Ew1-1580782

[flatlander]

hey i have a 84 crx replaced the motor once with a Ew1-1581782 and now i need to replace it. I have a Ew2-1448703 and the cluch wont seem to go on the spline properly, any idea's or is this motor just not gonna work. The motor is outta a 86 CIVIC could use some help really need to be driving this car thx

 

[AHHVTEC]

from what i have gathered if both motors are si motors it will fit im waiting on some email right now to know for sure