Trans pan question

[Mr_Rich]

I realized that it's time for a fluid change in my 700R4 that I installed 35K miles ago. I pay close attention to my engine oil, but the trans oil is one I tended to overlook. I started on a trip down south in 100 degree heat a week ago and when I made a rest stop for my dog after thirty miles my trans was dripping trans fluid and the back of my truck and undercarriage was just spotted with oil mist. I thought, "Oh $h!#", and topped off the quart I was low and headed back home.
I washed the undercarriage when it cooled off and removed the lower bell housing cover for an inspection. Everything seemed to be good as far as expensive repairs go. I tightened down the test plug on the driver's side of the trans and re-torqued the pan bolts. That seemed to take care of the worst of the trouble.
On my original 700R4 I ran a B&M deep trans pan and I went 230K+ miles on that trans. I was thinking of using a deep 4L60E pan from the 96-98 year trucks on my 700R4, but some of the sites say the part won't fit. Is there something different on the trans pans that I'm not aware of? I have a K-truck so room to fit is not a problem unless the layout or bolt pattern is different on the later trans. ???