BUG: Indesign CC 2014 - significant image artifacts with 'export as JPG'

Issue
Spreads exported from InDesign as maximum quality JPGs have heavy artifacts not present in PDF's with equivalent image compression settings.
Steps
Export spread to JPG (max, baseline, 300ppi)
Export spread to PDF (image compression set to JPG, maximum)
Compare both files in Photoshop at 100%
Results
Maximum quality JPGs are significantly artifacted.
Expected Results
Maximum quality JPGs should be identical to PDF images with equivalent image compression settings (and should be virtually indistinguishable from original files sized equivalently in Photoshop (and saved via Photoshop's 'Save for Web').
Please Note
I'm very familiar with the limitations of JPG's in pre-press work. Please trust that I have legitimate reasons for needing InDesign to export spreads as JPGs with the same image quality as is possible when exporting as a PDF (or using Photoshop's 'Save For Web' function with the source file sized identically as the spread in question.)
Samples
exhibit A: spread exported as PDF (compression set to JPG, maximum quality)
exhibit B: spread exported as JPG (maximum quality)

Rob,
Thank you for running your test!
Since posting (and just before reading your reply), I discovered an additional constraint on replicating the issue:
–it only appears when the linked image has been upscaled* (in my example, 107.1%)
     *keep in mind, the PDF was upscaled to the same degree, ruling out it being solely an upscaling issue
–testing at 'even-magnification' scales (i.e. 150%) simply resulted in increased pixelation compared to the same PDF export (see samples below)
–testing at 'odd-magnification' scales (i.e. 101%) generated random artifacts (like those visible in the samples of my initial post)
–as such, this is likely more of a resampling/aliasing issue than jpg-artifacting.
That is, it would seem that upscaled images seem to enjoy a higher-quality resampling method when exported as PDFs.
I'd be curious to see how your test fared with upscaled images.
samples
image scaled at 150%, exported as PDF (compression set to JPG, maximum quality)
image scaled at 150%, exported as JPG (maximum quality, anti-alias**)
     **tested with & without anti-aliasing, results were identical

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