Are you talking about the differences between the 5300 and 5301?
Well, the original 5300 Victorian mansion has patterned wallpapers in every room that covered the entire wall, rather than just a border design on the 5301.
The 5300 has window boxes on the ground and 1st floors whereas the 5301 only has window boxes on the ground floor.
The first and second floor on the 5301 are larger and have a recess in the middle to allow easier access to the rooms.
The 5300's dividing walls on the ground and first floor come right up to the edge of the floor and have doorways in them.
The curtains in the 5300 are made of a felt material which was replaced by plastic on the 5301.
The 5300 came with two staircases which are optional on the 5301.
Both have the same steck assembly system which many feel is better and more robust than the system X system used on the latest 5302 Grande Mansion.
Many of us on Playmofriends would agree that the 5300 is far superior to the 5301. It is certainly more detailed and authentic looking and the furniture sets for it are more realistic
and less colourful than the room sets for the 5301, but the 5301 is still a beautiful toy and
I think the design was changed to make it more play friendly with the bigger rooms and easier
access.
I think I've covered the main differences, but if any one else can add anything else to the list please do

I have just bought a brand new 5301, all the room sets and extra floor and will be reviewing it very soon. I thought I'd better get it while it's still fairly easy to get hold of. I must say that I prefer it to the 5302 Grande Mansion which I reviewed last June.
The colour change between the 5300 and 5301 is probably what makes it look less realistic and is what I dislike most about the 5301, but compared to a lot of Chinese made toys, it is a well made and detailed toy that most girls, some boys and some 43 year old men would
love to own.

Hope that helps.