We have these in our local RI dictionary as synonyms. There were created as such in 2003 and I’m copying the test description here in case that helps:
Presence of autoantibodies against soluble liver antigens (SLA) which react with liver cytokeratins by EIA method reported as EU-Elisa Units. The presence of SLA antibodies has almost 100% specificity for autoimmune hepatitis, although only 12-30% have these antibodies. Thus, a negative SLA IgG test does not rule out autoimmune hepatitis. Auto Immune Hepatitis (AIH) Type 3 is characterized by the presence of autoantibodies against soluble liver antigens (SLA) which react with liver cytokeratins.