Sorry, there most assuredly is a difference. For two reasons:
1) Pre-war intelligence is never 100% accurate. Sounds decisions must be made on whatever information is on hand. That's why corroborating sources are so important, if available. But it still probably won't reach the "proof" threshold demanded by our media (but only when Pubbies are involved).
2) There may well be evidence/proof of a classified nature, which the Administration does not wish to disclose.