Often military assault courses will be standardised, and will have, for example (in the UK), a six foot and a ten foot wall, a climbing net, some type of bar to climb over, and a high rope or net that must be crossed (these being or representing the most likely difficult terrain that a soldier will come across). The standardisation means that every course will be to the same quality, though it also means that there will be certain parts that may be familiar if practised.
However they have different purposes. For example they can be short (less than a minute) with a range on the end (e.g. Junior Leaders, Folkstone), or long (five minutes) as at Thetford. This is partially because of space restraints and training objectives. The short one can be run as an individual course and a warmup for the range. The long Thetford course is more of an exercise in endurance and teamwork.