421781 (2014 QG22) vs 53576 (2000 CS47)

These two asteroids are a potentially interesting couple.
I do not know if this couple is already known and if it is really a couple with a common origin.

Let's look at the JPL data, showing very similar orbital parameters:
421781 (2014 QG22)
Orbital Elements at Epoch 2457200.5 (2015-Jun-27.0) TDB
Reference: JPL 5 (heliocentric ecliptic J2000)

Element	Value	Uncertainty (1-sigma)	Units
e	.1415490034245739	7.6497e-08
a	2.219666740174171	5.0262e-08	AU
q	1.905475125167845	1.6225e-07	AU
i	5.547751979163497	1.1933e-05	deg
node	270.894647775993	0.00023172	deg
peri	334.1685226014454	0.00025596	deg
M	170.5342535281013	0.00011344	deg
tp	2456628.311384753553 (2013-Dec-01.81138475)	0.00037629	JED
period	1207.897517520007 3.31	4.1027e-05 1.123e-07	d yr
n	.2980385295758646	1.0123e-08	deg/d
Q	2.533858355180498	5.7376e-08	AU

 Orbit Determination Parameters

# obs. used (total)      49      data-arc span      3697 days (10.12 yr)      first obs. used      2004-08-14      last obs. used      2014-09-28      planetary ephem.      DE431      SB-pert. ephem.      SB431-BIG16      condition code      0      fit RMS      .55494      data source      ORB      producer      Otto Matic      solution date      2015-Jan-08 13:35:22

Additional Information

Earth MOID = .893565 AU

T_jup = 3.631

53576 (2000 CS47)
Orbital Elements at Epoch 2457200.5 (2015-Jun-27.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)

Element	Value	Uncertainty (1-sigma)	Units
e	.1413172303277337	5.195e-08
a	2.219866104654218	1.5604e-08	AU
q	1.906160775046069	1.1284e-07	AU
i	5.548153406788004	6.1614e-06	deg
node	270.899183954788	6.9605e-05	deg
peri	334.2072656882382	7.5251e-05	deg
M	151.5995810376835	2.9164e-05	deg
tp	2456691.773809093385 (2014-Feb-03.27380909)	9.8063e-05	JED
period	1208.060256319952 3.31	1.2737e-05 3.487e-08	d yr
n	.2979983805581422	3.142e-09	deg/d
Q	2.533571434262367	1.7809e-08	AU

Orbit Determination Parameters

# obs. used (total)      610      data-arc span      7436 days (20.36 yr)      first obs. used      1994-07-08      last obs. used      2014-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-BIG16      condition code      0      fit RMS      .49974      data source      ORB      producer      Otto Matic      solution date      2015-Mar-09 16:42:10

Additional Information

Earth MOID = .894238 AU

T_jup = 3.631

 I tried to run the Mercury simulator (BS2 integrator, timestep 1 day) with the nominal parameters, with this result (graph done with the R package)

Kind Regards,
Alessandro Odasso