>>2034449 (LB)

>>2034559 (LB)

>>2034507 (LB)

It's the best match yet. Same resolution and bit depth. Same iTXt chunk with EXIF data mentioning photoshop.

And a histogram of the lower byte is very similar.

Yours appears to be sampling at one-bit more actual bit depth. Your phone may have resized it in little; and the interpolation created the intermediate values. Pretty good match, otherwise.

The only other difference is that most of Q's pics have a 1-bit alpha channel (shown as the big white area). This is probably due to a small difference in software versions.

Bingo. Mystery solved.