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I've always assumed the hollow ones are newer, as it will save a small amount of ABS on each brick.
https://bricks.stackexchange.com/questions/1493/lego-with-hollow-posts-underneath-dates
For example, the Homemaker sets of the 1970s, always found with a lot of tiles in their set inventory, has many sets with the 1965 introduced "tiles without grooves" and 1973 introduced "tiles with grooves" mixed together in Homemaker sets. I once had a (1974) mint 266 Child's Bedroom Set with red and black tiles with the grooves, and the white tiles without the grooves.
I have seen 6075 sets (USA version of Yellow Castle) with bricks of the same size have a mix of the bricks with the moulding pip on the studs (newer), and moulding pips on the short side of the bricks (older). The list is endless...
The oldest known model (that I am aware of) with a mix of elements from different periods was a 1236 Garage set of 1955-57. During the slotted bricks era (1949-56) LEGO parts had slots on the side of the bricks (to hold in the studless top windows, doors, and a few other parts). In 1956 the slotted bricks were replaced by non-slotted hollow bottom bricks. However... TLG still had a quantity of the older garage doors/frames/bases (for use with the older slotted bricks) in their newer parts inventory. Since TLG... 'NEVER THROWS ANYTHING AWAY'.... they decided to use the new LEGO parts with their leftover older inventory....
So... since TLG wanted to use up older parts inventory... the older garage door frame (without studs on top, but with "4 wings" on the side)... were held in place by slotted bricks. Starting in 1956 (when the slotted bricks were replaced with regular bricks)... 4 older slotted 1x2 bricks were included in the garage kit (on the left side of image) to hold the older garage door/frame in place. This was an interesting way to prevent TLG from discarding older parts.
TLG has always used up old inventory when mold changes (new part type introductions) were made to LEGO sets. As I already mentioned.... TLG never threw anything away. And this makes some buyers of LEGO sets think that that their sets have parts that really don't really belong in their sets, when they actually do! The number of sets that have this issue probably number into the thousands!
I'm sure this has driven Bricklink catalog/parts admins crazy! ;-)