What would be the difference between a:

T3/T4 and a T3/T40E if they both were to have the exact same specs? Will one spool faster or create anymore power then the other?

someone help me out please!

If its the same specs then its just the same turbo. The "E" tells you its an E housing with an E wheel which is easy to recognize cause it will usually only have 6 blades for the compressor wheel. The other popular t3/t4 uses a "B" housing wich is usually not much different in appearance, although sometimes can use a different looking backplate then the E. THe B compressor wheels will most often use a 7 blade compressor wheel.
Usually an E turbo will flow more air hence more power, where the B doesnt but most times is more efficient.

Hope this clears some stuff up for you.
A good site to look at for specs, differences, etc is turbonetics.com

thanks for the info . . . I really appreciate it.