Is the dozer blade on the M728 the same as the one fitted to M48A1s (as in Berlin in 1961)???

The M728 is fitted with a M9 dozer blade, while the early M48's could be fitted with a M8/M8A1 blade...

According to Cookie Sewell's review of Academy's 1/35th scale M9 Dozer Blade Set (#1374) :
"The M9 was identical to the M8 series except for the mounting fittings that connected the blade and its associated control hardware to the front of the tank. The M8s differed in where the hydraulic lines for operating the blades attached to the hull; early models attached to the top right rear of the tank, and later models ran their lines down an armored cover to a connector at the left bottom rear of the hull. The M9 used the same system as the late M8 series blades."

H.P.

The hydraulic system for the M728 was internal and not routed under the road wheel arms like on the M60 and M48. But the blades were virtually identical.