Question about Collector's edition "Behind the scenes"

I hope I am asking it in the right section, but recently I got my hands on LotV Collector’s edition “Behind the scenes” Blu-Ray/DVD combo with additional material. And because of that my question is, as I do not own Blu-Ray reader, if both of the disks contain same material, just Blu-Ray hes better quality than DVD, or does it contain something different that I am missing out, because I have only CD/DVD reader?

Thanks in advance for all the replies!