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SFR not included in comercial Chip

Dear Sr.
Can i access registers (reading and writing) SFR inserted at different addresses from the comercial 8051 ones? For example the following addresses registers are not accessible for writing:
SFR LDO_CTRL = 0xC0;
SFR CH1 sfr = 0xC5;
sfr CH2 = 0xC6;
SFR RX_F1 = 0xC9;
SFR RX_F2 = 0xCA;
SFR RX_P1 = 0xCB;
SFR RX_P2 = 0xCC;

KEIL IDE displays the following message:

SFR_EXTRAS1.C(38): error C202: 'LDO_CTRL': undefined identifier
SFR_EXTRAS1.C(43): error C202: 'CH1': undefined identifier
SFR_EXTRAS1.C(44): error C202: 'CH2': undefined identifier
SFR_EXTRAS1.C(45): error C202: 'RX_F1': undefined identifier
SFR_EXTRAS1.C(46): error C202: 'RX_F2': undefined identifier
SFR_EXTRAS1.C(47): error C202: 'RX_P1': undefined identifier
SFR_EXTRAS1.C(48): error C202: 'RX_P2': undefined identifier