El sitio oficial del ECFMG indica:
When you apply for Step 1 or Step 2 CK, you must select one of the testing regions from the list below where you will take the exam. Test centers offering Step 1/Step 2 CK were located in the countries listed below for each testing region. However, the availability of test centers is subject to change without notice. Before selecting your testing region, visit the Prometric website or contact Prometric for current information on the availability and location of test centers for Step 1 and Step 2 CK.
Por ello SI es posible realizar STEP 1 y STEP 2 CK desde Venezuela.