熟練 and 熟知: skilled execution and thorough familiarity
Compare skill in performing work with detailed knowledge of a route or subject, keeping performance and familiarity as distinct evidence.
Skilled performance with 熟練
熟練 (じゅくれん) refers to acquired skill in performing work. The example 「熟練した職人が細かな模様を彫った。」 is translated as “A skilled artisan carved an intricate pattern.” Identify the skill or work performed rather than substituting knowledge alone for its execution.
The example 「この作業には長年の経験と熟練が必要だ。」 is translated as “This work requires years of experience and skill.” This work requires long experience and skill. That requirement does not fix the time needed to acquire every skill.
Knowing a subject well with 熟知
熟知 (じゅくち) refers to thorough familiarity with a subject. The example 「案内人は山道の危険な場所を熟知している。」 is translated as “The guide knows every dangerous spot on the mountain path.” The focus is what is known well, such as a route or content.
The example 「担当者は機械の構造を熟知した上で修理した。」 is translated as “The technician repaired the machine after fully understanding its structure.” The technician understood the structure and then repaired the machine. Separate the knowledge from the later action without extending one repair to proficiency in every repair task.
What is performed and what is known
熟練 emphasizes skilled execution; 熟知 emphasizes thorough knowledge of a subject. A skilled person can also know the subject well, so knowledge and performance are not incompatible abilities.
Check what someone can perform and what they know. A guide's knowledge of routes and another person's practical skill need not provide the same evidence.
Does 熟知 of a subject establish 熟練 in every task related to it?
Show the answer and why
No. 熟知 concerns what is known thoroughly, while 熟練 concerns a skill or task performed proficiently. They can coexist, but the evidence of knowledge and performance must be checked separately.