I had a Google and found this:
The key differences between the 2 are:
The trade version has the option to turn the 3 pre-set timers off whilst the retail one doesn't.
Trade has 3 temperature settings whilst retail has 2.
Trade has 3 curl direction settings; right, left and automatic alternate curl. Retail has a fixed alternate curl setting.
Trade has 3 heaters, retail has 2 heaters.
Trade has 2.8m swivel cord and retail has 2.5m swivel cord.
So, it doesn't look like there are too many differences tbh.