Whoa guys, remember. There is a difference between re-manufactured vs. rebuilt. A reman engine is basically a new engine other than the head and blocks are used but are within factory tolerances.
Within the BMW catalog it is a re-manufactured engine or new not rebuilt.
Tiato got it right..a short block is just the block and all components, no engine dressing. While a long block includes the heads.
To the OP, the reman'd engine will be fine.
2013 M3 Coupe-MR/BLK ZCP, ACM test pipes, BPM Stg2 dev. tune and Megan catback, AFE Stg2. with C/F elbow VMRV810 19x10&19X11 275/295 Mich PSS.
Previous rides: 2011 M3 Coupe-MR/Blk
2007 Porsche 997C2S Speed Yellow/Blk sport seats
2004 BMW M3 Imola/Blk