The second one states that it's KC type but it looks similar to what I have. And my bag says it's lime and cement as binders but no proportions are indicated.
KC mortar is an abbreviation for lime-cement mortar. This mortar is an older type that contains two binders, slaked lime and Portland cement. Note that it is specifically slaked lime in the product, which allows the slaked lime to set and form regular lime (also known as chalk or limestone). This helps bind the sand (the aggregate in the product).
Most products today are not KC mortar but pure Portland cement products. However, they contain limestone flour as an aggregate because it affects how the Portland cement sets. It is not used as a binder. Portland cement mixed with limestone flour is called masonry cement (originally sold in the 50s as "Gullex" in Sweden, the name remains).
MUR & PUTSBRUK PROBAU B/M 2.5 - 20KG is stated to be a KC mortar in the product sheet:
MURBRUK M2.5 20KG/SÄCK is not a KC mortar according to the product sheet:
(Do not use old opened mortar powder that has been lying in the garage for a long time.)
Grout with hydraulic lime mortar instead, unless the joints are very dark on the rest of the house. It looks better if you match the color of the grout with the rest if you have a brick facade. Hydraulic lime mortar is hard enough (almost like regular c-mortar, which is also suitable for regrouting) but also very flexible, so there's no risk of a gap between the stone and the grout because the mortar is too stiff. Then you just wash away everything you've smeared with hydrochloric acid, and it comes off much more easily than c-mortar.
