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Yes, histograms are different, because FRV and Lr histograms shows different data:

FRV: shows unprocessed raw data histogram (no white balance, no tone curve). Exposure adjustments just shifts numbers on X-axis because raw data not changed.

Lightroom displays processed image histogram with all adjustments made:

  • white balance
  • Exposure adjusment (including hidden one, so called BLE or 'Adobe hidden exposure')
  • Tone (contrast) curve applied

FRV histogram is intended for image culling: select best exposed image from sequence of (similar, but differently exposed) images.

Lr histogram shows processing/adjustment results.