Do the type-specific WKT- constructors function differently from ST_GeomFromText?
However cute and undocumented, all these functions map internally to Create_func_geometry_from_text in item_create.cc,. For this reason, I would advise using ST_GeomFromText() which best reflects that.

GEOMCOLLFROMTEXT
GEOMETRYCOLLECTIONFROMTEXT
GEOMETRYFROMTEXT
GEOMFROMTEXT
LINEFROMTEXT
LINESTRINGFROMTEXT
MLINEFROMTEXT
MPOINTFROMTEXT
MPOLYFROMTEXT
MULTILINESTRINGFROMTEXT
MULTIPOINTFROMTEXT
MULTIPOLYGONFROMTEXT
POINTFROMTEXT
POLYFROMTEXT
POLYGONFROMTEXT
ST_GEOMCOLLFROMTEXT
ST_GEOMETRYCOLLECTIONFROMTEXT
ST_GEOMETRYFROMTEXT
ST_GEOMFROMTEXT
ST_LINEFROMTEXT
ST_LINESTRINGFROMTEXT
ST_MLINEFROMTEXT
ST_MPOINTFROMTEXT
ST_MPOLYFROMTEXT
ST_MULTILINESTRINGFROMTEXT
ST_MULTIPOINTFROMTEXT
ST_MULTIPOLYGONFROMTEXT
ST_POINTFROMTEXT
ST_POLYFROMTEXT
ST_POLYGONFROMTEXT