Seems to me the the same tractor but the 1652 was $2500 cheaper, the 1648 a little over $1K cheaper again. Prices are from May of last year.
Quotation on new Tractor/Cab/Loader
New Massey Ferguson 1660-4wd Cab Tractor with the following specifications;
Factory Cab with Air Conditioning/Heater/Radio CD
60 HP 4 cyl Diesel Engine (46.4 PTO HP)
Dyna QPS 12F 12R Powershuttle with 4 speed Powershift
Independent 540rpm PTO
Power steering
Auxiliary Valve
Ag Tires front 9.5x16 Rear 16.9x26
3 year Powertrain Warranty
New Massey Ferguson DL130 Quick Attach Front End Loader with Heavy Duty Skid steer QA 72” Bucket
Our Cash Price after all Rebates $38,250.00
That was the dealers starting price, I got a little better than another 5% off that price. Rears filled, all oils and filters for the 50 hour service and a free delivery from 250 miles away. Prices here in Ontario were a little better but comparable at the time I was pricing them. Canadian dollars too of course.
Good luck