short answer is no....Im 99% sure
there is a write up on yotatech related to this...82 diesel looking to swap in l52.....i didn't look beyond first reply but dude was saying what I thought based on below:
....this is me, not the yotatech post.....I have an 80 (gas burner) that someone else swapped a l52 in place of l45. I believe you will need the crossmember and to weld in frame mounts for the l52 (which you don't have) in order for it to fit. My frame mounts look different from yours and appear to sit forward of what your pics look like and from where I can see marks on my frame. I don't know why they even cut mine off unless they tried to move those first and realized it wouldn't work. You will have no 2nd (front bell housing w/ l52). You will also have to deal with drive shaft alterations (likely both front and rear). At least w/ my 20r I have had slave cylinder issues and have to use a late model slave cylinder with weird connections to mesh with earlier model hoses...you have a later model but it is diesel and not US so I know nothing about that.
I will try and post pics of mine below for reference, but also totally off topic...You mentioned the import status. I live in Oakland and looked at buying an imported samurai from Asia (guy already had it on peninsula and was selling on CL) as you can find nice ones for cheap. I researched what it took to get it tagged/to pass smog...and it is virtually impossible for something this old.
Onward with rant, I did switch a w56 into an 81, which is what you should do given you have to move the mounts anyway. The w56 is WAY better than the l-series for cruising around town and on highway. I mounted to w56 cross member (which you can find easily) onto angle iron welded to frame and drilled. You will also need to lop off ends of xmember and weld angle iron onto that and drill to match up with frame mounts. You will also have to cut a little of the cab out for shifter...but not much...it can still look very clean. You will almost definitely have to do some flange matching/drilling as well.
let us know what you end up doing.....tell dude to check the requirements for getting tags because I believe he will find it's damn near impossible.