Almost certainly the only difference is the packaging. Here in the States it is known as the 'Original Uncut Version',
and is also 292 minutes, which of course is 4 hours 52 minutes. It is the longest - there is no "6-hour" version. I assume this mistake came about because the miniseries as six episodes, each about 48 minutes (probably 55 minutes with opening and closing credits for each episode).