First of all, congratulations to the purchase.
There are of course very significant differences in the construction of these two cameras (mirror reflex vs prism). The way of operating them is different, too, as it would be between a production camera like a Beaulieu, and a high-end camera such as a Canon. But frankly, if you are familiar with cine-film cameras in general, you should be able to understand how it works pretty much out of the box.
The regular Beaulieu 4008-series models use the TTL exposure control paradigm just like the Canon. You are likely to continue using external lightmeters for ambitious productions, even though the internal lightmeter of the regular Beaulieu 4008-series is very reliable and precise (and combined with a zoom lens can replace a spotmeter if needed). The Super 8 aesthetic combined with the latitude of current negative film stock should keep you from overly worrying about correct exposure, though. It really depends how exact you want to be, and what subject/object you are shooting.
Yes, you are correct: due to the required timing of the alternating phases of the guillotine shutter, the maximum exposure time at 24 fps is 1/86 sec (1/87 sec for 25 fps). You can further shorten that by closing the variable shutter, normally at a 100° opening angle. It is operated by the topside lever.
You won't be able to get the smoother motions and XL-focused exposure times of ~1/58 sec that you know from Canon or other XL cameras like Bauer or Nizo. So be prepared for a different visual experience once you get the first reels, rushes or scans back.
There are a few differences between the proper Beaulieu 4008-series models, and those models modified by Pro8mm. Pro8mm will have included a manual. If it's any help, you can also check out my overview/review of the Beaulieu 4008 in this forum's FAQ here (click me). Just click on and download the two attached documents in that post.