Instead of asking people on here I decided to contact BOSCH and get their recommendation.

I explained that I was going to use a 4 inch angle grinder with to cut through a plaster and lathe wall.  I would like their recommendation for a blade as there are a lot of choices.

After explaining I wanted a blade and not the angle grinder the person said they'd have to check.  When they returned they gave me the following recommendation;
https://www.homedepot.com/p/Bosch-4-5-in-Double-Row-Diamond-Cut-Off-Wheel-for-Sanding-Thermo-Plastic-Protective-Paint-Finishes-on-Concrete-and-Fiberglass-DC4510H/202920447?keyword=DC4510H&semanticToken=20030000010_88613700540834_n3z3+20030000010+%3E++st%3A%7Bdc4510h%7D%3Ast+cnn%3A%7B0%3A0%7D+cnr%3A%7B8%3A0%7D+cn1%3A%7B0%3A0%7D+f%3A%7Bb%7D+cnv%3A%7B1%3A0%7D+oos%3A%7B0%3A1%7D+tgr%3A%7BNo+stage+info%7D+qu%3A%7Bdc4510h%7D%3Aqu

Model # DC4510H    4.5 in. Double Row Diamond Cut Off Wheel for Sanding Thermo-Plastic Protective Paint Finishes on Concrete and Fiberglass

I really felt this one would be what I wanted and had called to check  

Model # DB4542C