Some months ago I asked the similar question to jcert Inititative themselves ( firstname.lastname@example.org
). Here is their answer:
Regarding your question:
Can I include SCWCD (Sun Certified Web Component Developer) SUN's exam as
an Application Development for the Java Platform exam (Skill 2B) ?
The answer is "no" at this time. The Sun does not have any jCert
certification exams in the Level 2 area. Sun is only participating in jCert
at Level 1 and Level 3. Candidates who are interested in getting a Certified
Solutions Developer certification will need to take the 2A (vendor-neutral
exam from Prosoft-CIW, Oracle or IBM) and the 2B exam (from Hewlett-Packard,
IBM or Oracle).