WES and CACB fulfill two entirely different (and unrelated) functions.
WES determines if the DEGREE or educational Credential you obtained in your home country is equivalent to a Canadian degree. This only serves the purpose of establishing eligibility and CRS points for your Express Entry profile.
On the other hand, the
CACB determines if your foreign architectural education is equivalent to a Canadian PROFESSIONAL degree. Why is this required? Because the title 'Architect' is a protected title and the profession of Architecture is regulated in Canada. To practice as an Architect, you need to have received an education satisfying minimum hours of training in specific technical categories. Under a program called 'Academic Certification', the CACB will assess your foreign course syllabus to determine if you meet the technical requirements of Canadian education. If you do, you receive a certificate stating that your foreign professional education is equivalent to an architectural degree from an accredited school/ university in Canada.
Once you receive this certificate, you can register as an 'Intern Architect' with any provincial body of Architects in Canada. After enrolling in the Intern Architect Program (IAP), you need to complete approximately 3,720 hours under the guidance of a licensed architect, appear for an exam and an interview before you receive the title of 'Architect'.
If you have previously practised as a licensed Architect in your home country, you may be eligible for BEFA (Broadly Experienced Foreign Architect). This is route is more extensive (and expensive) and requires that the Candidate have worked in Canada for a minimum duration of 6 months under the supervision of a local Architect.
You do not need to complete Academic Certification with CACB to work in the Architecture industry. You could seek employment as an Architectural Designer, Architectural Graduate - so long as you do not directly use the title 'Architect'. You will however be unable to register as an 'Intern Architect' or gain hours under the IAP or work towards your license, until you do receive such a certificate.