They are almost identical, with two exceptions.
First the 2005 version requirement to have the lab ensure that the environment remains a safe workspace by making sure it is neat are gone (17025:2005 5.3.5 is gone).
Second the 2017 version specifies that offsite testing by the lab is done under conditions that continue to provide for technically valid results.
Demonstrating conformance is identical if the lab does not do offsite testing. Demonstrating conformance requires demonstration of environmental controls appropriate to the needs of the work if done offsite, under the new version.
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