Comparison of core power at 5 GHz and total power at 408 MHz of radio galaxies from Giovannini et al. (1988, 2001); Giovannini (2004), including all 3C and B2 radio galaxies and radio quasars (black dots), along with the three sources studied here, as labelled (red dots). Because of the high z, K-correction was applied to these sources for a comparison with low-redshift sources. The solid black line is the best fit of 3C+B2 sample, while the vertical dashed line highlights the phenomenological division between FRI and FRII sources. According to this division, SDSS J0100+2802 and SDSS J0306+1853 can be classified as low-power FRII, while B2 1023+25 is a highly powerful FRII and is distant from the correlation, as expected for a strongly beamed blazar.